Highlight that GHCP migration support for framework apps is in preview

Author: twsouthwick

docs/core/porting/github-copilot-app-modernization-overview.md

@@ -59,25 +59,31 @@ Feedback is important to Microsoft and the efficiency of this agent. Use the [Su
 
 The modernization agent supports upgrading projects coded in C#. The following types of projects are supported:
 
-- ASP.NET and related technologies such as MVC, Razor Pages, Web API
 - Blazor
 - Azure Functions
 - Windows Presentation Foundation
 - Windows Forms
 - Class libraries
 - Console apps
 
+> [!WARNING]
+> ASP.NET and related technologies such as MVC, Razor Pages, Web API are still in preview. You may use the tool to attempt
+> upgrading these, but be aware it will only work for limited scenarios. Please see [ASP.NET Migration](~/aspnet/core/migration/fx-to-core)
+> for details on recommendations for these kinds of migrations.
+
 To learn how to start an upgrade, see [How to upgrade a .NET app with GitHub Copilot app modernization](how-to-upgrade-with-github-copilot.md).
 
 ### Upgrade paths
 
 The following upgrade paths are supported:
 
 - Upgrade projects from older .NET versions to the latest.
-- Upgrade projects from .NET Framework to the latest version of .NET.
 - Modernize your code base with new features.
 - Migrate components and services to Azure.
 
+> [!WARNING]
+> Upgrading projects from .NET Framework to the latest version of .NET is still in preview.
+
 ## Migrate .NET projects to Azure
 
 The modernization agent combines automated analysis, AI-driven code remediation, build and vulnerability checks, and deployment automation to simplify migrations to Azure. The following capabilities describe how the agent assesses readiness, applies fixes, and streamlines the migration process: